python-pyyaml: correct license name

LICENSE file contains MIT license text and README file clearly mentions
pyyaml is released under MIT license.

Signed-off-by: Rahul Bedarkar <rahulbedarkar89@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/python-pyyaml/python-pyyaml.mk

@@ -8,7 +8,7 @@ PYTHON_PYYAML_VERSION = 3.12
 PYTHON_PYYAML_SOURCE = PyYAML-$(PYTHON_PYYAML_VERSION).tar.gz
 PYTHON_PYYAML_SITE = https://pypi.python.org/packages/4a/85/db5a2df477072b2902b0eb892feb37d88ac635d36245a72a6a69b23b383a
 PYTHON_PYYAML_SETUP_TYPE = distutils
-PYTHON_PYYAML_LICENSE = Python software foundation license v2
+PYTHON_PYYAML_LICENSE = MIT
 PYTHON_PYYAML_LICENSE_FILES = LICENSE
 PYTHON_PYYAML_DEPENDENCIES = libyaml